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Old 30 May 2003, 14:22   #11
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Do most of you guys drain all the fuel out when you are going to leave the engine for a while, or let the fuel sit in the engine/lines etc? I've looked at a couple of other threads and they argue for and against either option. What are your thoughts?
Personally I've decided that I am going to start the engine at least once a month and let it run for a while each time (with fresh fuel) over winter/lay up period.
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Old 30 May 2003, 15:31   #12
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I drain my little 2s each time.

Keith (this is my small contribution) Hart
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Old 30 May 2003, 17:25   #13
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Quote:
Originally posted by Jizm
Do most of you guys drain all the fuel out when you are going to leave the engine for a while, or let the fuel sit in the engine/lines etc? I've looked at a couple of other threads and they argue for and against either option. What are your thoughts?
Does anybody know how modern fuel pumps used by Fuel Injected engines cope when being run dry?
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Old 30 May 2003, 17:44   #14
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identifying prob

The problem you describe could be either electrical or fuel, it is the case that there is a low rev coil in the stator and high rev coil, if you can start your Yam but the revs wont build it would point to the high rev coil or its pick up, however to be sure if your problem is electrical or fuel try this.See if you can get the fault to occur while the rib sits on the trailer with motor gearcase in the water, run the engine and if it wont rev beyond the revs you describe while on the trailer, turn the motor off unclip one HT lead see if the motor will run on two cylinders, be careful here not to touch the plug cap, if it will run on two cylinders carefully with a spare plug fitted to the loose cap using an insulated pliers hold the body of the plug to earth, rev the engine and if your fault comes in see if the plug stops sparking at the same time the fault occurs be careful not to get shocked from the end of the plug, if your plug keeps sparking as the revs die you may be able to decide if it is fuel or electrical.The motor may not run on two cylinders though so this test might not be possible for you to do. There could be as much as 14000 volts across the plug while sparking, very low current though, but enough for you to get a nice wake up cheers gavin
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Old 31 May 2003, 19:01   #15
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Id try that again david.
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Old 31 May 2003, 19:01   #16
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bet it isn't blocked carbs.
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Old 01 June 2003, 13:36   #17
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What makes you say that mr H20? Had a similar experience in the past?
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Old 01 June 2003, 15:20   #18
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Thinking about it I had a very similar problem with my Mercury 60 ELPTO. The engine would struggle to rev past 3500rpm while underload - out the water with the muffs on it would just about reach 5500rpm. It turned out to be water in the fuel. The carbs were cleaned and all was ok again.

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Old 02 June 2003, 04:48   #19
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Hmmmm,

I had this problem ones. I was an air leak in the fuel line. At low revs there was no problem, but at full throttle the engine was sucking in air from the leak.

Fortunately the previous owner had fitted an extra fuel line ready to go under the seat. (Nice one Pete).

Rene
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Old 04 June 2003, 14:29   #20
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Just to let you all know, it looks like it is the cdi unit is at fault and will be confirmed tommorrow. The unit has been metered out and gave the wrong readings to the spec. It also appears to be breaking down when revved and will not allow the engine past 2800rpm.
Will post again when Rib returns fully functional!!!
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